在高度强调食品安全性的今天 人们对食品加工与消费过程中卫生操作的要求不断提高 这一趋 势向各类食品加工企业提出了挑战 卫生学是一门关于如何达到特定卫生环境之要求的应用科学 由于食品安全对人们的重要性 卫 生学受到食品企业的特别重视 过去 那些未受培训或受训甚少 缺乏技能的雇员通常被派做清洁卫生 工作 但是 即使是清洁工也应该具备有关如何达到卫生要求的知识 过去清洁工 包括卫生管理员 极少学习有关卫生的知识 而相关的技术信息主要来自于管理机构提供的一些培训手册 企业和协会的 说明书以及设备和清洁剂公司的产品说明书中

( 一 ) 概述 SPECORD 200 是德国耶拿（蔡司）公司生产的高档双光束双检测器分光光度计，它提供 了样品和参比的同步测量。 双光路 SPECORD 200 同步测量能量数据，这些数据可以直接评估或者可以转换成透射或 吸收数据，浓度的测定是通过使用一个因子或运行一次校准来实现的，可以进行动力学测定

24.1 Junction Field-Effect Transistors JFET Biasing Transfer Characteristics. JFET Output Domai Resistance. Source Follower. Frequency and Time-Domain Response. Voltage-Variable Resistor 24.2 Bipolar Transistors Biasing the Bipolar Transistor Small-Signal Operation. A Small- Signal Equivalent Circuit.low -Frequency- Performancethe

Gennady Sh. Gildenblat 22.1 Physical Properties The Pennsylvania State University Energy Bands- Electrons and Holes. Transport Properties.Hall Boris Gelmont Effect. Electrical Breakdown. Optical Properties and University of Virginia

40.1 Grounding, Shielding, and Filtering John M. Roman Grounding.Shielding.Filtering Telematics 40.2 Spectrum, Specifications, and Measurement Techniques Martin A. Uman Procedures University of Florida, Gainesville

38.1 Wire Short Dipole. Directivity. Magnetic Dipole.Input Impedance. Arbitrary Wire Antennas. Resonant Half-Wavelength N.J.Kolias Antenna. End Loading. Arrays of Wire Antennas. Analysis of General Arrays. Arrays of Identical Elements Equally Spaced Raytheon Company

36.1Magnetism Static Magnetic Fields- Time-Dependent Electric and Magnetic Fields. Magnetic Flux Density. Relative Permeabilities.Forces on a Moving Charge. Time-Varying Magnetic Fields Maxwe Equations-Dia- and Paramagnetism. Ferromagnetism and Geoffrey Bate Ferrimagnetism. Intrinsic Magnetic Properties.Extrinsic

34.1 Introduction 34.2 Design Entry 34.3 Synthesis 34.4 Verification Timing Analysis. Simulation.Analog Simulation.Emulation 34.5 Physical Design

32.1 D/ and A/D Circuits D/A and A/D Converter Performance Criteria.D/A Conversion Processes. D/A Converter ICs A/D Conversion Processes.A/D Susan A.R. Garrod Purdue University Converter ICs Grounding and Bypassing on D/A and A/D

30.1 Power Semiconductor Devices Thyristor and Triac. Gate Turn-Off Thyristor(GTO). Reverse- Conducting Thyristor(RCT) and Asymmetrical Silicon-Controlled Rectifier (ASCR). Power Transistor Power MOSFET. Insulated-Gate Bipolar Transistor (IGBT). MOS Controlled